I tend to assume that my gf discusses some, maybe even most, of what happens within our relationship with her husband. After all, I discuss the relationship with my very close friends (I like to gush and/or ask for advice)! But if I do ever *ask* for privacy -- if I say something like "I'm really embarrassed about this desire, but..." or "I've never told anyone this, but..." -- it damn well better stay between the two of us!! I would expect that of any friend, and that extends to romantic partners.